Infant mattress



FIG. 1 is a top front perspective view of the invention.

FIG. 2 is a top rear perspective view of the invention.

FIG. 3 is a top plan view of the invention.

FIG. 4 is a bottom plan view of the invention.

FIG. 5 is a front elevation view of the invention.

FIG. 6 is a rear elevation view of the invention.

FIG. 7 is a left elevation view of the invention; and,

FIG. 8 is a right elevation view of the invention.

CLAIM The ornamental design for an infant mattress, as shown anddescribed.